Improvement in locks



UNITED STATES PATENT OFFICE.

JOSE A. PIMENTEL AND WVILLIAM H. SHUTE, OF NEW YORK, N. Y.

IMPROVEMENT IN LOCKS.

Specification forming part of Letters Patent No. 36,024, dated July 29, 1862.

To all whom it may concern:

Be it known that we, Josh A. PIMENTEL and WILLIAM H. SHUTE, of the city, county, and State of New York, have invented a new and Improved Lock; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is an internal side view of alock constructed according to our invention; Fig. 2, a transverse section of the same, taken in the line 00' m, Fig. 1.

Similar letters of reference indicate corresponding parts in the two figures.

The object of this invention is to obtain a lock of simple construction which will be, if not strictly burglar-proof, still very difficult to pick, so much so as to be unpickable to all except expert burglars.

The invention is designed more particularly to be applied to trunks, the front doors of dwellings, &c.; and it consists in the employment or use of a bolt-guard arranged with a division-plate in the lock, and the lock-bolt, as hereinafter described, andusing in connection with said parts a double key.

The invention also consists in the employ ment or use of spring-catches placed within the lock and arranged, as hereinafter described, so as to hold a pick or false key which may be introduced into the lock for the purpose of unlocking it illegitimately.

To enable those skilled in the art to fully understand and construct our invention, we will proceed to describe it.

A represents the case of the lock, which may be of rectangular or other proper form; and B is the bolt of the lock, which may be arranged in the usual way and provided with a recess or notch, a, for the bit of the key to catch into. (See Fig. 1.)

G is a partitionplate which is placed in the case A, and has two guides, b b, attached to it, between which a slide, D, is placed and allowed to work freely. The upper end of the slide D has a lip, 0, formed on it, which, when the bolt 13 is shoved outward and the lock is in a locked state, fits in a not-ch, d, in the bolt and prevents it from being shoved back. (See Fig. 1, in which the lock is shown in a locked state.) By the use of this slide it will be seen that before the bolt B can be shoved back and the lock unlocked the slide D must be shoved down. The slide D is kept engaged with the bolt B by means of a spring, E.

Fis akey formed of two parts, e f. (See Fig. 2.) The part c is constructed like an ordinary key, it being provided with a bit, 9, and a cylindrical shank, h. The part f of the key has a tubular shank, c, which is fitted loosely on the shank h of the part 6, and is provided with a bit, 3'. A spiral spring, k, is placed on the shank h of part e between the outer end of the'shank i and a shoulder, l, on shank h, and this spring has a tendency to keep the bitj of the tubular shank i in con tact with the bit 9 of the shank h.

In order to unlock the lock, the key is in serted into it, the bit 9 of the part c of the key passing through a hole in the partitionplate 0, j of the partf not passing through plate 0. The shank z is then turned so that its bitj will act upon the slide D and force it down free from the bolt '13, and the shank his then turned so that its bitg will act upon and throw back the bolt B.

In the back side plate of thelock-oase there is fitted a spring-catch, m, which is formed by having a projection, n, on a spring, 0. This projection is in line with the path of rotation of the notch or recess of the bit 9 of the part c of the key, and consequently will not interfere with the movement of the proper bit 9; but in case a fase key is inserted into the lockand turned past the projection n the latter will not allow the bit to be turned back to its original position, for the projection n has a beveled surface at one side to allow the false bit to force it back and pass it; butthe opposite edge is abrupt and serves as a stop, preventing the bit from being turned back. Several of these stops or spring-catches may be employed, and one, p, is shown inserted in the partition-plate G to serve as a stop for the bit j.

Thus it will be seen that in attempting to open the lock with a false key the latter will become fastened in it, and further efforts in that way prevented.

Having thus described our invention, what arranged, as shown, to turn independently of We claim as new, and desire to secure by Letters each other when said key is used in connec- Pat-ent, istion with a lock provided with abolt, B, slide 1. The slide or guard D, in combination with or guard D, and central plate, 0, for the purthe bolt B and central partition-plate, C, arpose set forth.

ranged substantially as and for the purpose JOSE A PIMENTED set forth.

2. The spring catches or stops mp, arranged WILLIAM SHUTE' to operate as and for the purpose specified. WVitnesses:

3. The double key K, or one formed of two JAMES LAIRD,

parts, 6 f, provided each with a bit, gj, and J. W. OOOMBS. 

